Adjustable grinder



FIG. 1 is a top, front and left side elevational view of an adjustable grinder showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a right side elevational view; and

FIG. 6 is a top plan view thereof. 

The ornamental design for an adjustable grinder, as shown and described. 